Wikipedia states that the speed of sound increases with roughly 0.6 m/s per degree Celsius. The speed of sound actually depends strongly on temperature and to a far lesser degree on the humidity of the air. Temperature dependence of the speed of sound So you need to divide the result by two.ĭistance (cm) = Speed of sound (cm/µs) × Time (µs) / 2ĭistance (cm) = 0.0343 (cm/µs) × 2000 (µs) / 2 = 34.3 cm The distance between the sensor and the object is actually only half this distance because the sound waves traveled from the sensor to the object and back from the object to the sensor. If you multiply the speed of sound by the time the sound waves traveled, you get the distance that the sound waves traveled.īut that is not the result we are looking for. Let’s say that the time between sending and receiving the sound waves is 2000 microseconds. Source: Īt 20☌, the speed of sound is roughly 343 m/s or 0.034 cm/µs. Ultrasonic distance sensors working principle. By measuring how much time passed between sending and receiving the sound waves, the distance between the sensor and the object can be calculated. If there is an object in front of the sensor, the sound waves get reflected back and the receiver of the ultrasonic sensor detects them. These sound waves travel through the air with the speed of sound, roughly 343 m/s. Ultrasonic sensors work by emitting sound waves with a frequency that is too high for a human to hear. How does an ultrasonic distance sensor work? As an Amazon Associate we earn from qualifying purchases. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on. Other Useful Links From Around The Web:.Example code HC-SR04 with DHT11 and I2C LCD.Example code HC-SR04 with DHT11 temperature sensor and Arduino.Example code HC-SR04 with I2C LCD and Arduino.How to use ping_median() digital filter.Interfacing ultrasonic sensors in 3 pin mode.Example code HC-SR04 with Arduino and NewPing library.Wiring – Connecting HC-SR04 to Arduino UNO.Temperature dependence of the speed of sound.Commercial-grade felt air filter for improved filtration.Tool-less air filter cover for easy access.Large ergonomic front handle with safety guard for increased comfort and control.Large rear handle provides comfort and great control.Rigid support bar allows straighter and more precise cuts.Tip guard reduces blade wear when cutting near the ground or walls.Commercial duty air filtration system for long engine life.double-sided, double-reciprocating blades provide the best cut quality Hedge trimmer comes with a 5-year consumer/2-year commercial warranty.Bush trimmer features a 21.2 cc professional-grade 2-stroke gas engine.ECHO PowerBlend gold oil or ECHO red armor oil Use a 50:1 ratio of fuel to oil mix for 2-stroke cycle engines, recommend using only fresh gas with a minimum octane rating of 89 or higher (mid-grade to premium) at all times.For questions about service and repair, please call Echo at 1-800-432-ECHO or reference the Service & Repair document.A zero-type grease fitting and tool-less air filter cover makes maintenance easy on this gas powered hedge trimmer unit. blades offer superior cutting performance and twice as many cutting edges as the remaining bush trimmer competition. The ECHO hedge trimmer HC-2020 is lightweight and offers professional-grade features for dependability.
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